Influence of Fines Contents on Soil Liquefaction Resistance in Cyclic Triaxial Test
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ORIGINAL PAPER
Influence of Fines Contents on Soil Liquefaction Resistance in Cyclic Triaxial Test Jungang Liu
Received: 21 February 2019 / Accepted: 21 April 2020 Springer Nature Switzerland AG 2020
Abstract Liquefaction is the most detrimental ground failure caused by strong earthquakes. Ground liquefaction leads to associated foundation and superstructure failures due to loss of bearing capacity and excessive deformation. An appropriate assessment of liquefaction is critical to the seismic safety evaluation of foundations and super structures. In this study, a series number of isotropically consolidated undrained cyclic triaxial test have been performed to evaluate influence of fines contents on soil liquefaction resistance. A total of 96 cyclic triaxial test was run on the uniform medium Monterey No. 0/30 sand with six different percentages of fine content. A total of 198 cyclic triaxial test was performed on the uniform medium concrete sand with five different percentages of fine content. Four different relative densities of 30%, 45%, 50% and 60%, two confining pressure of 103kpa and 207 kpa, six stress ratios (0.2, 0.25, 0.3, 0.35, 0.4 and 0.45) have been used for series of cyclic triaxial tests on two different soil types. Laboratory cyclic triaxial tests were conducted systematically to
J. Liu (&) Department of Civil Engineering, College of Civil Engineering and Architecture, Hubei Polytechnic University, No.16 North of Guilin Road, K8-206, Huangshi 435003, Hubei, China e-mail: [email protected] J. Liu Center for Geotechnical Engineering Science (CGES), University of Colorado Denver, Denver, USA
produce liquefaction potential curves.At a constant overall void ratio and PI, the increase in fines content up to 12% in the clean sand causes a decrease in liquefaction resistance. Beyond 20%, the further increases in fines content results in increase in liquefaction resistance. The threshold fines content, which is in the range of 12–20%, observed from nearly 300 of laboratory test results in this study. Statistical analyses were performed to formulate functional relationships for predicting liquefaction resistance of soils containing fines. For evaluating liquefaction potential for soils containing fines content, soil with 12–20% of fines content should be paid more attention.
1 Introduction The enormous damage due to soil liquefaction observed in both Anchorage, Alaska, USA and Niigata, Japan earthquake of 1964 stimulated geotechnical engineering studies of earthquake-induced soil liquefaction. Saturated loose sands subjected seismic shaking will generate excess pore water pressure due to the densification potential and dissipation restraint from the surrounding soils that gradually reduces its confining pressure. Eventually the confining pressure reaches zero and the soils lose the strength, liquefy, and spread. The soils will subsequently regain its strength due to the dissipation of excess pore water
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pressure and stabilize. Howeve
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